ifill: gloun then there's talk about a ground effort, and i saw the "new york times" recently quoted pentagon officials saying it would require more than 75,000 troops. now, that's because of how disperse this might be? >> it's a little of dispersal because you would have to go after many different sites, but also, depending on the circumstances, you might have to fight your way in. the hope would be that as some of these sites come within the territory controlled by the free syrian army, they will invite in outsiders to assist them in securing the sites that they'll number negotiations with the custodians and so forth and this can be done peacefull in which case the number of troops would be limited but some of the worst-case contingencies involve larger numbers. >> there were reports hezbollah set up camps next to these sites. how secure are the site? who is protecting them at this point? who is in charge? >> in charge, are elite troops, as far as we can tell, still loyal to assad, and more or less, we hope sitting tight and doing their job of maintaining-- managing the sites in a safe mann